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2 1,646,557 t 1927 A. F. PIEPER LIGET PROJECTING APPARATUS 'Filed April 21. 1923 2 Sheets-Sheet Q IN V EN TOR. 1759 I v i ,7 Oct. 25, 1927? -A. F. PIEPER 6 LIGHT PROJECTING APPARATUS Filed April 21. 1923 2 Sheets-Sheet 2 Patented Get. 25, 1927. i i

arass? ALPHONSE F. PIEPEE, OF ROCHESTER, NEW YORK.

The invention relates to light projecting apparatus of the variety commonly known as a. spotlight and adapted for projecting a beam of light in an adjustable direction for illuminating a particular locus or object,

as useful for example in the performance of dental work, one object of-the invention being to provide an efficient device of the 'tively low cost. the lnvention consists incertain lmproveabove character having a practical and econonncal form of construction, convenientto assemble and manipulate in use. Another object is to provide such apparatus comprising a plurality of interchangeable light projecting means for conveniently adapting the device to various uses. A further object is the provision of such a device having apractical form of construction providing for complete enclosure and shielding of the lamp parts to prevent the escape of stray light rays and heating of its exterior, as well as for the enclosure and'concealment of the electrical connections. Still a further object is the provision of a device of the above character, economically constructed for employing a standard lamp socket and lamp and to a large extent parts made of sheet metal formed and assembled at a compara- Tothese and other ends ments and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification. In the drawings: 4 Figure 1 is a side elevation of a light projecting device embodying my'present invention F igure 2 is a central sectional elevatio ofthe same somewhat enlarged;

Figure 3 i an enlarged sectional detail view on-the line 3*,3 in Figure 2;

Figure tie a central sectionalelevation of the device showing the lamp housing modified somewhat from the construct-ion shown in Figure 2;

Figure 5 is a sectional detail view on the line 5 5 in Figure 4t; 1

Figure 6 is an enlarged sectional view on the line 6 6% in Figure 1;

Figure 7 'is aside view of a portion of the light projecting tube and lamp shield, as

shown in Figure4. detached: FigureS is a side elevation of the device with another form of projecting means inter chang ably app1iecl*thereto, and a i F 9 is fragmentary sectional new menr-rnomcrrne APPARATUS.

vApplication filed. April 21, 1923. Serial No. 633,781.

of details of construction employed in F ig-- ure 8. l

Similar reference numerals throughout the several views indicate the same parts.

The invention is disclosed in the present instance, by way of illustration, as embodied in a preferred form of construction particularly adapted for use in dental operations and comprising a tubular-bracket 10, Figures 1 and 4, having an end formed with a joint portion 11 for association with a flex-- ible supporting arm by which the electrical connections are carried. This bracket is preferably formed at its other-end asa sleeve 12 with a passage or bore 13 connecting the latter with the joint portion 11 so that the electrical connections may be extended interiorly theret-hrough and thus be concealed and protected. Rotatably carried by the bracket sleeve 12 is a support 14 in the shape of a sleeve enclosing sleeve 12 and provided with a set screw 15 working in a slot 16 in the bracket. sleeve to prevent longitudinal movement of one on the other but providing for limited rotational adjustment about a common longitudinal axis. Support 14 has an end portion 17 with an externally threaded nipple 18 projecting therefrom for detachably supporting a'lamp socket 19 of the standard, self-contained and enclosed variety in common use, with a threaded end opening 20 detachably screwed on the nipple 18 and secured thereon as by means of a set screw 21. The socket is furthermore of the well known variety operated by push button means 22 and carries lamp 23, which latter, and preferably thesocket also, are provided .with protective housings, that of the lamp carrying the light projectingmeans proper as hereafter described.

The socket housing is preferably formed up from sheet metal as shown at 2 1, with a diameter larger than that of the socket so as to provide a space thereabout. The housing .is preferably constructed as shown, with an inturned flange 25 provided with-a washer 26 and clamped between the annular shoulder formed by the end 17 of thesupport and the end of the socket screwed on the sup port nipple, Toadditionally support and space the hoi'ising,the latter is provided with spacing collar means 27, secured thereto by screws 28 which connect the sectional portions in which the housing is constructed, The housing is provided war a or .alating' perforations 29 thrt iigh which.

the lamp housing has spaced oute and inner Walls, the latter of which serve as shields todecrease the heating of the housing exteriorj by the lamp, while also affording mean for producing ventilation and at the sametime effectively confining the light rays. To this end the socket housing has its extremity beaded or rolled as at to securely engage the peripheral edge of a circular opening in the outer wall 31 of the lamp housing.

whereby the latter is firmly supported on the socket housing. This section oi? the lamp housing is preferably of the hemispherical shape-shown having its circular edge portion rolled inwardly as at 82 to embrace the out- "wardly rolled edge 33 of a similarly shaped but smaller hemispherical inner shield or war-1184 which is apertured as at 35 to receive the lamp. The rolled edges 32 and 33 ot the outer and inner walls are preferably so formed asto maintain the engagement with each other by reason oi their confirmation, although they may be welded, soldered or otherwise 'joined. The inner wall is preterably formed with a series of ventilating;

perforations 36 and the outer wall with a similar set of perforations 37 which are staggered however with relation to perforations 36 to prevent the escape o'l light rays. The inner wall 34: of this section of the lamp housing is preferably formed with a thread 38 as shown with which engages the correspondingly threaded edge 39 of the complementary housing section 40. also of generally hemispherical shape except that it has a tubular extension 41 extending radially of the lamp filament for projecting thelight. The housing section likewise is constructed with spaced outer and inner Walls, the latter being shown at 41-1 as of'h'emi-spherical shape and projectin in spaced relation somewhat within the inner wall 3590f the other section. The walls 40 and'41' are provided with ventilating perforations l2 and 43, respectively, as described in connection withthe first housing section. Inner wall 41 may be supported in the manner shown in either Figures 2 or 4; In the first instance it is carried in spaced relation with the outer wall by means of" spacing sleeves 44- and bolts 4-5 while in the second instance this wall is formed as an extension of a lens mounting sleeve 46 detachably fitted in the inner end of the projecting tube 41. The metal of the sleeve and" tube may be struck up in the form of bosses 47 to locate and retain the sleeve in proper position in the tube. In the form of construction shown in Figure 2, a space 48 is left between the inner wall or shield 41 and the lens tube d6 to provide for ventilation.

The projecting tube i1 is preferably fitted with a condensing lens 49 mounted in disks 50 located in sleeve 4:6 by means of spring rings 51 as shown and as will be understood in the art. The outer end of the tube carries a pro ecting lens n2 suitably spaced from lens it), by means of which lens sys tem an intensified beam of light is projected at adesired locus of operation. It is to be noted that the axis of the projecting lens system intersects the rotational axis of the socket support adjacent the filament or point of illui'nination at a substantial angle so that by swinging the parts as a whole on the bracket the light beam may be adjusted through an arc to project it in a desired di rection. it l'ieing understood of course that the bracket itself may be adjustably mounted to provide for suitable adjustment of the beam in other planes.

As it is desired in various kinds of work and under various conditions to substitute for the intensified local illumination provided by the projected system described above other kinds of illumination as. for GX- ample. that of a more generally diffused character, a plurality of lamp housing sections may be 'irovided for interchangeable association with the housing section 31 in place ot the section 40. Thus in Figure 8 is shown a different form of section comprising an annular sheet metal ring 53 having a threaded portion for detachable engagemcnt with the section 31 and also a rolled periphery 54 holding a globe T5 of opal or other glass forprojccting a diffused light. Other torms o't projectiiig means may obviously be provided for interchangeable association with the device in placeb't those described.

It is apparent from the above description and the drawings that the invention provides a convenient form of projector or spotlight which may be readilyadjusted to project the light in a desired direction, and wh ch by means of its interchangeable proecting means may be readily adapted to suit the requirements oi various conditions and kinds of work. The lamp parts are effectively housed in to prevent the escape of any stray light rays as well as heating of the housing; exterior and the electrical connections tor the lamp are fully concealed and protected within the bracket and support. The device is economically designed to utilize a standard lamp socket and lamp and to be constructed in large measure of sheet metal parts. manufactured at a comparatively low cost. The parts are furthermore easily detachable and-lend themselves I claim as my invention:

to a general shape and design of pleasing appearance.

1. In a li'ht projecting apparatus, the combination of a support, a lamp socket car ried thereby, a lamp in said socket, a housing for the lamp includingfixed and detachable sections, said fixed section being connected with the support and said detachable section including inner and outer shell-like portions, the former being adapted to re ceive a portion of the lamp and the latter being adapted to detachably engage the fixed section of the Ihousing,and a tube carried by said detachable section and provided with light projecting means.

2. In a light projecting apparatus, the combination of a bracket, a support thereon having an externally threaded nipple projecting therefrom, a "lamp socket having an opening in threaded engagement with said nipple, a lamp in said socket,'a' sheet metal housing for said socket having an inturned flange clamped between said support and socket, a sheet metalrhousing forthe lamp carried by the socket housing embodying jfixed and detachable sections, the latter including an inner shell partially surrounding the lamp and supported in spaced relation to the fixed section, and light projecting means carried by and communicating with the lamp housing. v

3. In a light projecting apparatus, the

combination of a bracket, a support thereon, .a standardlamp socket carried by the support, a lamp in said socket, a housing for the socket in spaced relation therewith, a perforated housing for the lamp, shield means carried interiorly by the lamp'hous- 'ing in spacedrelation therewith and provided with perforations staggered with respect to said houslng perforations, and a lens means carried by said :lamp housing and communicating therewith withits axis intersecting the; axis of the lamp adjacent its filament, said support and the parts car ried thereby being rotatable upon the bracket about the axis of the socket.

4. In a light projecting apparatus, the combination of a support having an externally threaded nipple projecting therefrom, a lamp socket having an opening in threaded engagement with said nipple, a lamp in said socket, a sheet metal housing for said socket having an inturned flange clamped between said support and socket, a

sheet metal housing for the lamp having spaced inner and outer walls provided with perforations staggered with respect to one another and a lens system for projecting light from said lamp.

5. In a light projecting apparatus, the combination of a support, a lamp socket carried by said support and provided with a lamp,a housing for the lamp comprising sections separably connected with each other to aiford access to the lamp and each having spaced inner and outer walls provided with perforations staggered with respect to one another, and light projecting means carried by one of said sections. a

6. In a light projecting apparatus, the combination of a support, a lamp socket carried by said support and provided with a lamp, a housing for the lamp of circular shape in cross section and comprising threadedly and separably connected parts affording access to the lamp, each ofsaid sections having spaced inner and outer walls providedwith perforations staggered with respect to one another, and light projecting means carried by one of said housing parts.

7. In a light projecting apparatus, the

combination of a support, a lamp socket carried by said support and provided with a lamp, a sheet metal housing for the lamp of substantially spherical shape comprising separably connected hemispherical parts affording access to the lamp, said sections hav 1 3 'ing spaced inner and outer walls provided with perforations staggered with respect to one another, and light projecting lens means carried by one. of said housing parts.

- .8. In a light projecting apparatus, the

combination of a supporthaving an externally threaded nipple projecting therefrom, alamp socket having an opening in threaded engagement with said nipple, a

lamp in said socket, asheet metal housing forsaid socket having an inturned flange clamped between said supportand socket, a sheet metal housing for the lamp of substan- 'tially spherical shape comprising separably connected hemispherical parts affording access to the lamp, said sections having spaced inner and'outer walls provided with perforations staggered with respect to one another, and light projecting lens means carried by one of said housing parts.

,9. .In a light projecting apparatus, the combination of a bracket, a support rotatable on said bracket, a lamp socket carried by said support, a housing for the socket, a housing for the lamp carried by said socket housing, a lens holding tube carried by said lamp housing with its axis intersecting the rotational axis of said support for projecting a beam of light in an adjustable direction, and a second lens holding in said socket, a housing for said lamp, and a projectinglens tube carried by saidhousing and including outwardly and inwardly projecting portions, the latter being enlarged to receive the lamp within the housbeing rotatable with the support about the axis of the socket, a housing for said socket, a housing for said lamp in separable sections each comprising spaced inner and outer walls provided with perforations staggered with respect to one another, one of said sections. being carried by said socket housing, and a light projecting lens tube carried by the other of said housing sections.

12. In a light projecting apparatus, the combination of a tubular bracket, a tubular support rotatably adjustable on said bracket with an externally threaded nipple projecting therefrom, a lamp socket having an opening provided with threads to receive said nipple and adapted to have its connections with a source of power enclosed within said tubular bracket and support, a lamp in said socket, a housing for said socket spaced therefrom with an inturned flange clamped between said support and socket, a housing for said lamp in separable sections each comprising spaced inner and outer walls provided with perforations staggered with respect to one another, one of said sections being carried by said lamp housing, and a light projecting lens tube carried by the other of said sections with its axis intersecting the rotational axis of said support adjacent the lamp filament, said lens tube and lamp being rotatable with the support as a unit about the axis of the socket.

13. In a light projecting apparatus, the combination of a. tubular bracket, a tubular support rotatably adjustable on said bracket, a push button lamp socket threadedly connected with said support and adapted torotate therewith about the axisof the socket and to have its power leads extended interiorly through said tubular bracket and support, a lamp in said socket, a perforated housing for said socket'in'spaced relation therewith with said push button operating through ore of said perforations therein, a housing for said lamp carried by said socket housing, and light projecting means carried by said lamp housing with its axis intersecting the rotational axis of said support adjacent the lam filament. i

14. In a light projecting.apparatus, the combination of a support, a lamp socket carried thereby, a lamp housing upon theisupport including inner and outer'secti'ons, said inner section comprising inner and outer spaced shell like portions, the-outer portion having its inner end connected with the support and the inner portion having an opening through its inner end and having its outer end engaging saidouter portion, said outer section including inner and outer shell like portions, the latter of which is detachably connected with the inner section, alamp disposed in said sections andprojected through said opening into saidsocket and light projecting means carried by the outer section.

15. In a light projecting apparatus, the combination of a support, a lamp socket carried thereby, a sectional lamp housing comprising an inner section fixed upon the support and a pair of interchangeably associated outer sections provided respectively with different light projecting means, said inner section and one of said outer sections each including spaced shell like portions and to project into said inner and outer sections.

ALPHONSE F. PIEPER; 

